133 lines
3.4 KiB
JavaScript
133 lines
3.4 KiB
JavaScript
var bigNumberify = require('./bignumber.js').bigNumberify;
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var throwError = require('./throw-error');
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var zero = new bigNumberify(0);
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var negative1 = new bigNumberify(-1);
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var names = [
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'wei',
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'kwei',
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'Mwei',
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'Gwei',
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'szabo',
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'finny',
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'ether',
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];
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var getUnitInfo = (function() {
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var unitInfos = {};
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var value = '1';
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names.forEach(function(name) {
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var info = {
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decimals: value.length - 1,
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tenPower: bigNumberify(value),
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name: name
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};
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unitInfos[name.toLowerCase()] = info;
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unitInfos[String(info.decimals)] = info;
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value += '000';
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});
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return function(name) {
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return unitInfos[String(name).toLowerCase()];
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}
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})();
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function formatUnits(value, unitType, options) {
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if (typeof(unitType) === 'object' && !options) {
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options = unitType;
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unitType = undefined;
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}
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if (unitType == null) { unitType = 18; }
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var unitInfo = getUnitInfo(unitType);
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// Make sure wei is a big number (convert as necessary)
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value = bigNumberify(value);
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if (!options) { options = {}; }
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var negative = value.lt(zero);
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if (negative) { value = value.mul(negative1); }
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var fraction = value.mod(unitInfo.tenPower).toString(10);
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while (fraction.length < unitInfo.decimals) { fraction = '0' + fraction; }
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// Strip off trailing zeros (but keep one if would otherwise be bare decimal point)
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if (!options.pad) {
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fraction = fraction.match(/^([0-9]*[1-9]|0)(0*)/)[1];
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}
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var whole = value.div(unitInfo.tenPower).toString(10);
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if (options.commify) {
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whole = whole.replace(/\B(?=(\d{3})+(?!\d))/g, ",")
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}
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var value = whole + '.' + fraction;
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if (negative) { value = '-' + value; }
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return value;
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}
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function parseUnits(value, unitType) {
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var unitInfo = getUnitInfo(unitType || 18);
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if (!unitInfo) { throwError('invalid unitType', { unitType: unitType }); }
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if (typeof(value) !== 'string' || !value.match(/^-?[0-9.,]+$/)) {
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throwError('invalid value', { input: value });
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}
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// Remove commas
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var value = value.replace(/,/g,'');
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// Is it negative?
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var negative = (value.substring(0, 1) === '-');
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if (negative) { value = value.substring(1); }
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if (value === '.') { throwError('invalid value', { input: value }); }
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// Split it into a whole and fractional part
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var comps = value.split('.');
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if (comps.length > 2) { throwError('too many decimal points', { input: value }); }
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var whole = comps[0], fraction = comps[1];
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if (!whole) { whole = '0'; }
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if (!fraction) { fraction = '0'; }
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// Prevent underflow
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if (fraction.length > unitInfo.decimals) {
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throwError('too many decimal places', { input: value, decimals: fraction.length });
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}
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// Fully pad the string with zeros to get to wei
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while (fraction.length < unitInfo.decimals) { fraction += '0'; }
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whole = bigNumberify(whole);
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fraction = bigNumberify(fraction);
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var wei = (whole.mul(unitInfo.tenPower)).add(fraction);
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if (negative) { wei = wei.mul(negative1); }
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return wei;
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}
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function formatEther(wei, options) {
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return formatUnits(wei, 18, options);
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}
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function parseEther(ether) {
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return parseUnits(ether, 18);
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}
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module.exports = {
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formatEther: formatEther,
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parseEther: parseEther,
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formatUnits: formatUnits,
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parseUnits: parseUnits,
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}
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